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M11 > 11.15 Oxygen > Flashcards

11.15 Oxygen Flashcards

1
Q

At what altitude does the usable oxygen half?

A

18,000 feet (5480 m)

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2
Q

What is the cabin altitude of aircraft when it is cruising?

A

8,000 feet

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3
Q

How does lack of oxygen affect humans at :

a) 10,000 ft
b) 14,000 ft
c) 15,000 - 20,000 ft

A

a) faster breaths to compensate for lack of oxygen
b) exhaustion and sleepiness
c) loss of concentration, partial memory loss, muscle ache, loss of judgement

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4
Q

Why is oxygen used on aircraft different to others used on the ground?

A

Aviators breathing oxygen is dry, moisture in normal oxygen would freeze

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5
Q

What is important about tooling when working on oxygen systems?

A

Must be clean and oil free

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6
Q

What does the crew oxygen system supply to?

A

Cockpit crew only

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7
Q

Where are oxygen bottles stored?

A

Lower deck

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8
Q

What are the typical materials that oxygen bottles are made of?

A

Steel alloy or Kevlar (composite)

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9
Q

What colour are oxygen bottles on aircraft?

A

Dark Green

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10
Q

At 21 degrees C what is the maximum capacity of an oxygen bottle?

A

3200

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11
Q

Where can the actual bottle pressure be found?

A

Direct reading pressure gauge

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12
Q

What information would you need to determine how full the bottle is? [2]

A
  • Actual bottle pressure and temperature

- Referral to chart

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13
Q

Where would an over pressure indication be found?

A

Near the oxygen filler port

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14
Q

How are the lengths of high pressure lines reduced in an oxygen system?

A

Pressure regulator located near the oxygen bottle

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15
Q

When does the oxygen begin to flow in crew oxygen masks?

A

When the mask is removed from the storage box

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16
Q

What does the crew mask consist of? [4]

A
  • Harness
  • Face piece
  • Diluter demand regulator
  • Microphone
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17
Q

What are the 3 operating modes of the diluter demand regulator?

A
  • Normal
  • 100% oxygen
  • Emergency
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18
Q

At what altitude will passenger oxygen masks deploy automatically?

A

14,000ft

19
Q

What are the 2 ways oxygen is supplied to the system?

A
  • Chemical system

- Gaseous system

20
Q

What does a thermal compensator do?

A

Distributes the heat that may occur during recharging

21
Q

What does a pressure reducer do?

A

Reduces the pressures leaving the bottle to an intermediate pressure

22
Q

If there are more than 1 oxygen bottle, what happens to the indications on the flight deck?

A

The pressure is averaged between the bottle by a voltage averaging unit

23
Q

How can the pilots oxygen masks be tested?

A

Press to test and reset lever without taking the mask out of the stowage box

24
Q

Where are the passenger oxygen masks located?

A

The passenger service units

25
Q

How is the passenger oxygen system activated? (2)

A
  • automatically by pressure switch

- manual on flight deck if pressure switch fails

26
Q

What can be used for maintenance to open a single PSU containing the passenger oxygen masks without activating the whole system?

A

A special tool

27
Q

How does the chemical supply system operate?

A

The doors operate electrically, dropping masks, oxygen will only flow when the masks are pulled where the oxygen generation process starts

28
Q

What happens when the pin pulled from the oxygen generator?

A

Striker triggers a chemical thermal reaction inside the generator

29
Q

What is the oxygen generator filled with?

A

Sodium chlorate

30
Q

How is oxygen generated?

A

High temperature decomposition of sodium chlorate

31
Q

How does an oxygen generator indicate that it has been used?

A

Heat generated changes the colour of the indicator on the side of the bottle

32
Q

In a gaseous supply system, where is the oxygen supplied from?

A

oxygen bottles, similar to those used in the crew system

33
Q

In the gaseous oxygen system, what does a flow control unit do? (4)

A
  • provide a shut off function when not in use
  • activate the system
  • produce the pressure push to open the PSU’s
  • reduce the intermediate oxygen pressure to an adequate level for breathing
34
Q

What is used to transport the pressure push?

A

Ring line

35
Q

How do the PSU’s open?

A

High pressure oxygen flows for a few seconds moving the diaphragm and moving a plunger downwards.
This moves the latch plate and hooks to the left,
Opening the door

36
Q

What need to be done before oxygen will flow to the masks?

A

They need to be pulled and tightened by at least one lanyard, pulling a pin

37
Q

Other than crew and passenger oxygen systems, what is the other type?

A

Portable oxygen system

38
Q

Where can portable oxygen equipment be located?

A

Flight deck and near exits in passenger compartments

39
Q

What is the intended use of a portable oxygen bottle?

A

For emergency and first aid use

40
Q

What is the maximum filling pressure of a portable oxygen bottle?

A

1800 psi

41
Q

What components does the cylinder head of the portable oxygen bottle consist of? (6)

A
  • manual shut off valve
  • pressure gauge
  • frangible disk for over pressure relief
  • pressure regulator reducing oxygen pressure to suitable levels
  • built in relief valve In case pressure regulator fails
  • filling valve allows oxygen bottle to be filled
42
Q

What do smoke hoods provide protection against?

A

Eyes and respiratory system for crew,

Prevent inhalation of smoke and noxious gases

43
Q

What does the smoke hood consist of? (3)

A
  • the hood itself
  • inner mask
  • oxygen generator
44
Q

What two types of masks are used with portable oxygen bottles?

A
  • Full face smoke mask

- continuous flow oxygen masks (first aid purposes)

M11 (22 decks)

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